Refund

I been renting a vehicle from flexidrive for 2 years never missing payments okay so 2 months ago my bank finally helped me with vehicle finance so i gave a month and a half notice on my rental so i also took it back earlier than i was supposed to so i have an email confirming that my last debit wil be April and that the contract is canceled so came this month yet you still took a debit order. That went off the 26 May then i was told my refund will take 7 days okay so Monday i received a email stating the money will reflect in my account 24 to 48 hours okay we are on day 4 now still no money and still no prove of payment i have been phoning out so much airtime. I'm so disappointed